Was it something I said!?! HD Locking
 

Okay, I'm starting to get miffed.
Decided to upgrade the HD in the ol' box. Got myself a new Maxtor 120GB, backed-up old disk, installed, formatted & loaded evox no problem.
But for love nor money can I lock the hard disk and it work back in the 'box.

I run to the letter the locking tutorial at xbox-scene. The drive, according to atapwd.exe locks, but once put back in the xbox, it doesn't boot. Error 06.

Anyone, any ideas?

It's okay, I've managed to get it sorted.
Thank havens for Config Magic :D